diff --git a/dlls/mmdevapi/client.c b/dlls/mmdevapi/client.c
index bec3e440b7c..8779ae1dc23 100644
--- a/dlls/mmdevapi/client.c
+++ b/dlls/mmdevapi/client.c
@@ -406,6 +406,31 @@ const IAudioCaptureClientVtbl AudioCaptureClient_Vtbl =
     capture_GetNextPacketSize
 };
 
+HRESULT WINAPI client_QueryInterface(IAudioClient3 *iface, REFIID riid, void **ppv)
+{
+    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);
+
+    if (!ppv)
+        return E_POINTER;
+
+    if (IsEqualIID(riid, &IID_IUnknown) ||
+        IsEqualIID(riid, &IID_IAudioClient) ||
+        IsEqualIID(riid, &IID_IAudioClient2) ||
+        IsEqualIID(riid, &IID_IAudioClient3))
+        *ppv = iface;
+    else if(IsEqualIID(riid, &IID_IMarshal)) {
+        struct audio_client *This = impl_from_IAudioClient3(iface);
+        return IUnknown_QueryInterface(This->marshal, riid, ppv);
+    } else {
+        *ppv = NULL;
+        return E_NOINTERFACE;
+    }
+
+    IUnknown_AddRef((IUnknown *)*ppv);
+
+    return S_OK;
+}
+
 ULONG WINAPI client_AddRef(IAudioClient3 *iface)
 {
     struct audio_client *This = impl_from_IAudioClient3(iface);
diff --git a/dlls/winepulse.drv/mmdevdrv.c b/dlls/winepulse.drv/mmdevdrv.c
index cdf5920d985..abde1c80b2a 100644
--- a/dlls/winepulse.drv/mmdevdrv.c
+++ b/dlls/winepulse.drv/mmdevdrv.c
@@ -377,33 +377,8 @@ HRESULT WINAPI AUDDRV_GetAudioEndpoint(GUID *guid, IMMDevice *dev, IAudioClient
     return S_OK;
 }
 
-static HRESULT WINAPI AudioClient_QueryInterface(IAudioClient3 *iface,
-        REFIID riid, void **ppv)
-{
-    ACImpl *This = impl_from_IAudioClient3(iface);
-
-    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);
-
-    if (!ppv)
-        return E_POINTER;
-
-    *ppv = NULL;
-    if (IsEqualIID(riid, &IID_IUnknown) ||
-            IsEqualIID(riid, &IID_IAudioClient) ||
-            IsEqualIID(riid, &IID_IAudioClient2) ||
-            IsEqualIID(riid, &IID_IAudioClient3))
-        *ppv = iface;
-    if (*ppv) {
-        IUnknown_AddRef((IUnknown*)*ppv);
-        return S_OK;
-    }
-
-    if (IsEqualIID(riid, &IID_IMarshal))
-        return IUnknown_QueryInterface(This->marshal, riid, ppv);
-
-    WARN("Unknown interface %s\n", debugstr_guid(riid));
-    return E_NOINTERFACE;
-}
+extern HRESULT WINAPI client_QueryInterface(IAudioClient3 *iface,
+        REFIID riid, void **ppv);
 
 extern ULONG WINAPI client_AddRef(IAudioClient3 *iface);
 
@@ -547,7 +522,7 @@ extern HRESULT WINAPI client_InitializeSharedAudioStream(IAudioClient3 *iface,
 
 static const IAudioClient3Vtbl AudioClient3_Vtbl =
 {
-    AudioClient_QueryInterface,
+    client_QueryInterface,
     client_AddRef,
     client_Release,
     client_Initialize,